Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Inclusion of apatite in ruby from Tanzania
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Agate from Reichweiler, Germany
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Bubbles and swirls in moldavite (natural glass)
Partially etched diamond crystal
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